/*
 * jQuery UI Accordion 1.6
 * 
 * Copyright (c) 2007 Jörn Zaefferer
 *
 * http://docs.jquery.com/UI/Accordion
 *
 * Dual licensed under the MIT and GPL licenses:
 *   http://www.opensource.org/licenses/mit-license.php
 *   http://www.gnu.org/licenses/gpl.html
 *
 * Revision: $Id: jquery.accordion.js 4876 2008-03-08 11:49:04Z joern.zaefferer $
 *
 */

;
(function($) {

	// If the UI scope is not available, add it
	$.ui = $.ui || {};

	$.fn.extend({
		accordion : function(options, data) {
			var args = Array.prototype.slice.call(arguments, 1);

			return this.each(function() {
				if (typeof options == "string") {
					var accordion = $.data(this, "ui-accordion");
					accordion[options].apply(accordion, args);
					// INIT with optional options
				} else if (!$(this).is(".ui-accordion"))
					$.data(this, "ui-accordion", new $.ui.accordion(this,
							options));
			});
		},
		// deprecated, use accordion("activate", index) instead
		activate : function(index) {
			return this.accordion("activate", index);
		}
	});

	$.ui.accordion = function(container, options) {

		// setup configuration
		this.options = options = $.extend({}, $.ui.accordion.defaults, options);
		this.element = container;

		$(container).addClass("ui-accordion");

		if (options.navigation) {
			var current = $(container).find("a").filter(
					options.navigationFilter);
			if (current.length) {
				if (current.filter(options.header).length) {
					options.active = current;
				} else {
					options.active = current.parent().parent().prev();
					current.addClass("current");
				}
			}
		}

		// calculate active if not specified, using the first header
		options.headers = $(container).find(options.header);
		options.active = findActive(options.headers, options.active);

		if (options.fillSpace) {
			var maxHeight = $(container).parent().height();
			options.headers.each(function() {
				maxHeight -= $(this).outerHeight();
			});
			var maxPadding = 0;
			options.headers.next().each(
					function() {
						maxPadding = Math.max(maxPadding, $(this).innerHeight()
								- $(this).height());
					}).height(maxHeight - maxPadding);
		} else if (options.autoheight) {
			var maxHeight = 0;
			options.headers.next().each(function() {
				maxHeight = Math.max(maxHeight, $(this).outerHeight());
			}).height(maxHeight);
		}

		options.headers.not(options.active || "").next().hide();
		options.active.parent().andSelf().addClass(options.selectedClass);

		if (options.event)
			$(container).bind((options.event) + ".ui-accordion", clickHandler);
	};

	$.ui.accordion.prototype = {
		activate : function(index) {
			// call clickHandler with custom event
			clickHandler.call(this.element, {
				target : findActive(this.options.headers, index)[0]
			});
		},

		enable : function() {
			this.options.disabled = false;
		},
		disable : function() {
			this.options.disabled = true;
		},
		destroy : function() {
			this.options.headers.next().css("display", "");
			if (this.options.fillSpace || this.options.autoheight) {
				this.options.headers.next().css("height", "");
			}
			$.removeData(this.element, "ui-accordion");
			$(this.element).removeClass("ui-accordion").unbind(".ui-accordion");
		}
	}

	function scopeCallback(callback, scope) {
		return function() {
			return callback.apply(scope, arguments);
		};
	}

	function completed(cancel) {
		// if removed while animated data can be empty
		if (!$.data(this, "ui-accordion"))
			return;
		var instance = $.data(this, "ui-accordion");
		var options = instance.options;
		options.running = cancel ? 0 : --options.running;
		if (options.running)
			return;
		if (options.clearStyle) {
			options.toShow.add(options.toHide).css({
				height : "",
				overflow : ""
			});
		}
		$(this).triggerHandler("change.ui-accordion", [ options.data ],
				options.change);
	}

	function toggle(toShow, toHide, data, clickedActive, down) {
		var options = $.data(this, "ui-accordion").options;
		options.toShow = toShow;
		options.toHide = toHide;
		options.data = data;
		var complete = scopeCallback(completed, this);

		// count elements to animate
		options.running = toHide.size() == 0 ? toShow.size() : toHide.size();

		if (options.animated) {
			if (!options.alwaysOpen && clickedActive) {
				$.ui.accordion.animations[options.animated]({
					toShow : jQuery([]),
					toHide : toHide,
					complete : complete,
					down : down,
					autoheight : options.autoheight
				});
			} else {
				$.ui.accordion.animations[options.animated]({
					toShow : toShow,
					toHide : toHide,
					complete : complete,
					down : down,
					autoheight : options.autoheight
				});
			}
		} else {
			if (!options.alwaysOpen && clickedActive) {
				toShow.toggle();
			} else {
				toHide.hide();
				toShow.show();
			}
			complete(true);
		}
	}

	function clickHandler(event) {
		var options = $.data(this, "ui-accordion").options;
		if (options.disabled)
			return false;

		// called only when using activate(false) to close all parts
		// programmatically
		if (!event.target && !options.alwaysOpen) {
			options.active.parent().andSelf()
					.toggleClass(options.selectedClass);
			var toHide = options.active.next(), data = {
				instance : this,
				options : options,
				newHeader : jQuery([]),
				oldHeader : options.active,
				newContent : jQuery([]),
				oldContent : toHide
			}, toShow = options.active = $([]);
			toggle.call(this, toShow, toHide, data);
			return false;
		}
		// get the click target
		var clicked = $(event.target);

		// due to the event delegation model, we have to check if one
		// of the parent elements is our actual header, and find that
		if (clicked.parents(options.header).length)
			while (!clicked.is(options.header))
				clicked = clicked.parent();

		var clickedActive = clicked[0] == options.active[0];

		// if animations are still active, or the active header is the target,
		// ignore click
		if (options.running || (options.alwaysOpen && clickedActive))
			return false;
		if (!clicked.is(options.header))
			return;

		// switch classes
		options.active.parent().andSelf().toggleClass(options.selectedClass);
		if (!clickedActive) {
			clicked.parent().andSelf().addClass(options.selectedClass);
		}

		// find elements to show and hide
		var toShow = clicked.next(), toHide = options.active.next(),
		// data = [clicked, options.active, toShow, toHide],
		data = {
			instance : this,
			options : options,
			newHeader : clicked,
			oldHeader : options.active,
			newContent : toShow,
			oldContent : toHide
		}, down = options.headers.index(options.active[0]) > options.headers
				.index(clicked[0]);

		options.active = clickedActive ? $([]) : clicked;
		toggle.call(this, toShow, toHide, data, clickedActive, down);

		return false;
	}
	;

	function findActive(headers, selector) {
		return selector != undefined ? typeof selector == "number" ? headers
				.filter(":eq(" + selector + ")") : headers.not(headers
				.not(selector)) : selector === false ? $([]) : headers
				.filter(":eq(0)");
	}

	$
			.extend(
					$.ui.accordion,
					{
						defaults : {
							selectedClass : "selected",
							alwaysOpen : true,
							animated : 'slide',
							event : "click",
							header : "a",
							autoheight : true,
							running : 0,
							navigationFilter : function() {
								return this.href.toLowerCase() == location.href
										.toLowerCase();
							}
						},
						animations : {
							slide : function(options, additions) {
								options = $.extend({
									easing : "swing",
									duration : 300
								}, options, additions);
								if (!options.toHide.size()) {
									options.toShow.animate({
										height : "show"
									}, options);
									return;
								}
								var hideHeight = options.toHide.height(), showHeight = options.toShow
										.height(), difference = showHeight
										/ hideHeight;
								options.toShow.css({
									height : 0,
									overflow : 'hidden'
								}).show();
								options.toHide
										.filter(":hidden")
										.each(options.complete)
										.end()
										.filter(":visible")
										.animate(
												{
													height : "hide"
												},
												{
													step : function(now) {
														var current = (hideHeight - now)
																* difference;
														if ($.browser.msie
																|| $.browser.opera) {
															current = Math
																	.ceil(current);
														}
														options.toShow
																.height(current);
													},
													duration : options.duration,
													easing : options.easing,
													complete : function() {
														if (!options.autoheight) {
															options.toShow.css(
																	"height",
																	"auto");
														}
														options.complete();
													}
												});
							},
							bounceslide : function(options) {
								this.slide(options, {
									easing : options.down ? "bounceout"
											: "swing",
									duration : options.down ? 1000 : 200
								});
							},
							easeslide : function(options) {
								this.slide(options, {
									easing : "easeinout",
									duration : 700
								})
							}
						}
					});

})(jQuery);
